[英]JSF, How to set a property in a different page/backing bean and then navigate to that page?
[英]Form backing bean is not retaining already set property values
我正在使用像这样的表单支持bean。
public class BeanData implements Serializable{
private String param1;
private String param2;
private String param3;
private String param4="india";
getters setters
}
然后在模型中发送bean对象,如下所示 -
@RequestMapping(value=/formPage, method={RequestMethod.GET,RequestMethod.POST})
public ModelAndView getPage(HttpSession session, ModelAndView modelAndView) {
BeanData formBean = new BeanData();
formBean.setParam2("123456"); // this param2 doens't have any field in JSP
modelAndView.addObject("formBean", formBean);
modelAndView.setViewName(PAGE);
return modelAndView;
}
@RequestMapping(value=submitData, headers="Accept=*/*", method={RequestMethod.POST})
public void submitData(@Valid @ModelAttribute("formBean") BeanData formBean, BindingResult result, HttpServletRequest request,HttpServletResponse response,ModelAndView modelAndView, HttpSession session) {
LOGGER.info("param1:"+formBean.getParam1()); // Param1 has a path map in jsp field. So whatever user is puuting into form field, that is getting populated here
LOGGER.info(" param2:"+formBean.getParam2()); // It has not been used in JSP. Though from controller it was populated before sending the bean to the jsp. but here the value is null . This is the concern
LOGGER.info("param3:"+formBean.getParam3());// Param1 has a path map in jsp field. So whatever user is puuting into form field, that is getting populated here
LOGGER.info("param4:"+formBean.getParam4());//thsi field also has not been used in JSP. But this property was set in bean instantiation. It is also getting retrieved successfully.
modelAndView.setViewName(SUCCESS PAGE);
}
我关心的是,我想使用setter方法设置一个bean属性,并希望将bean支持对象传递给JSP。 然后所有属性值应该绑定(我使用表单字段路径属性显式绑定的内容以及我在创建bean对象时已经设置的内容)到后备对象,它应该在控制器中接收。 请指导我在哪里做错了。
如果你想在JSP中保存param2
字段的值并将其恢复到表单提交,你可以使用隐藏字段绑定它,如下所示:
<form:hidden path="formBean.param2"/>
它不会显示在您的JSP中,但它将按原样保存您的值。
另一种方法是将BeanData
存储到会话中。
模型属性是请求范围的bean。 你可以用的解决方案:
@ModelAttribute
注释的方法,而不是在getPage
方法中执行。 Spring在处理请求之前执行使用@ModelAttribute
注释的方法,然后使用来自表单的属性更新对象。
@ModelAttribute("formBean")
public BeanData setFormBeanModel()
{
BeanData formBean = new BeanData();
formBean.setParam2("123456");
return formBean;
}
@RequestMapping(value=/formPage, method={RequestMethod.GET,RequestMethod.POST})
public ModelAndView getPage(HttpSession session, ModelAndView modelAndView)
{
modelAndView.setViewName(PAGE);
return modelAndView;
}
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